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There have been no large-scale, long-term studies to truly evaluate safety especially not for cancer risk
Discipline Over Speed If whitening is your end goal, understand this: PCOS + hormonal stress + higher melanin = slower visible change
Importantly, neonates and infants: The benzyl alcohol preservative is toxic to newborns
Another critical challenge lies in the limited understanding of enzyme activity under physiological and pathological conditions, which hampers the design of materials with predictable response kinetics
(PubMed) Powers HJ, Weaver LT, Austin S, Beresford JK
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